Song-dynasty water-powered trip hammer

Timeline

1. c. 31–800Central Plains region · Central PlainsChinese water-powered machinery began with the Han water bellows, and through the Wei, Jin, and Northern and Southern Dynasties to the Tang gradually developed intermittent pounding mechanisms driven by a vertical-shaft waterwheel with cams and pestle bars, providing the power base for later metallurgical forging.
2. 1061–1127Iron smelting districts across the Northern Song circuits · Northern SongThe Northern Song was strong and its mining and smelting industry flourished; water-powered trip hammers were installed in large numbers in iron smelting workshops across the circuits, replacing human pounding with waterwheels and becoming common power devices in mining districts, already quite widespread by the 1060s.
3. 1061–1200Chinese mining and smelting workshops · ChinaThe water-powered trip hammer was used specifically for metallurgical forging: water flow drove the waterwheel and cams, making the heavy hammer rise and fall periodically to repeatedly forge iron billets, easing labor intensity while increasing forging frequency and ironware quality, driving growth in Northern Song iron output.